Question

27th just give me the answer

Answer 1

it forms an ap 
 5+5 , 5+3+3+5, 5+3+3+3+3+5, ............
10,16,22.......
a=10
d=6
n=10 (given that 10 potatoes)
sn=n/2(2a+(n-1)d)
    =10/2(2(10)+(10-1)(6))
    =5(20+54)
    =5*74
    = 370